Yesterday, low-cost carrier Spirit launched a 10 percent off promotion for flights in early 2007. Today it's USA3000's turn. The tiny carrier, which serves the Northeast, Midwest, Florida, the Caribbean, and Mexico, is offering $10 off any flight between now and April 30, 2007.

To get the discount, you have to book online at the airline's website by 9:00 p.m. ET on January 2, and type the promo code "Celebrate" at checkout.